Threaded coupling-bolt.



No. 657,297. Patented Sept. 4, won.

- G. P. SHEFFIELD.

THREADED COUPLING BOLT. (Application filed June a, 1900. (No llodaL) Inveni'or':

PHOTO-LITNQ. wasullamn, n cy UNITED STATES PATENT OFFicE.

GEORGE P. SHEFFIELD,- OF ROCHESTER, NEW YORK, ASSIGNOR OF ONE- HALF TO LILIAN B. HOLLING, OF SAME PLACE.

THREADED COUPLING-BOLT.

SPECIFICATION forming part of Letters Patent No. 657,297. dated September 4:, 1900.

Application filed June 6, 1900.

To all whom it may concern:

Be it known that I, GEORGE P. SHEFFIELD, of Rochester, in the county of Monroe and State of New York, have invented a new and useful Improvement in Threaded Coupling- Bolts, which improvement is fullyset forth in the following specification and shown in the accompanying drawings.

My invention is a threaded bolt belonging more particularly to the class commonly known and understood as coupling-bolts, in parts, the same being hereinafter fully described and more particularly pointed out in the claims.

This bolt or device is in three parts-first, a threaded shaft or body; second, a detachable or removable thread-piece or thread to meet and coact with the thread of the shaft or body, and, third, a prismatic body in the form, as to its exterior, of a screw-nut for the bolt adapted to receive an ordinary wrench for turning it and constructed to surround or inclose the thread-piece.

Referring to the drawings, Figure 1 is a side elevation of the invention, parts.being broken away and longitudinally sectioned along the axis of the bolt. Fig. 2 is an end view of the device seen as indicated by arrow in Fig. 1. Fig. 3 is a longitudinal'axial section of the thread-piece sectioned on the dotted line 3 3 in Fig. 2. Fig. etisa side elevation of the device, showing a diiferent form of thread-piece, parts being longitudinally sectioned. Fig. 5 is an end view seen as indicated by arrow in Fig. 4.. Fig. 6 is a side elevation of the device, showing a round or cylindrical thread, parts being longitudinally sectioned. Fig. 7 is a side elevation of the threaded end of the bolt, the round or wire threads being axially sectioned.

A, Figs. 1, 2, and4, is the shaft or body of the bolt, which is of common form, provided with an ordinary head B. The bolt is formed with the ordinary V-thread aat one end, upon which is fitted to turn a thread-piece 1), Figs. 1, 2, and 3, formed internally with a thread 0 to fit and fill the thread a of the body A of the bolt. This thread-piece is adapted to be screwed onto or off of the body A like an ordinary threaded nut, and it may be made spiral, as shown in Figs. 1 and 3, or in other Sprial No. 19,306. (No model.)

for the purpose of receiving an ordinary wrench for turning. it. The exterior of the thread-piece and the interior of the controlling-body C have relative diameters, so that normally the thread piece projects at its larger end from the body 0, as shown. Now when the body 0 is turned against the opposing part D (of the machine or device to be pressed or held by the bolt) the thread-piece b will be caused to travel toward the part D or be drawn into the tapered body O. This on account of the taper fit will cause the yielding or compressible thread piece to firmly press the body A, tightening it thereon ever more firmly as the part C is turned by the wrench.

In the form shownin Figs. 4 and 5 the only change is in the construction of the threadpiece (1. Instead of being a spiral, as shown at b, Fig. 1, it is a simple band, tapered on its exterior to fit the controlling-body O and formed with a longitudinal slit g, so as to be compressible, as in the spiral form. As the controlling-body O is turned against the part D the thread-piece d will be drawn into the tapered body Oand tightened with great firmness upon the shaft A.

As shown in Figs. 6 and 7, the body or shaft A is formed with a spiral thread f, semicircular in crosssection instead of V-sha-ped, the thread-piece or thread 6 being a body, as wire, cylindrical in cross-section, wound in said semicircular spirals. The outer surface of this wire spiral istapered, as in the other cases, to receive the internally-tapered controlling-body O, the wire thread being drawn into the body O as the latter is turned.

The bearing of the body 0 against the outer surface of the thread-piece, in either form shown, being farther out from the axis of the bolt than the heari ng i of the thread; was against the bedg A Gfithe btiliittihfitli 0y is to cause the thread-piece to turn upon the threed-pieoecontrolling-bod 'he'lng taspecifie(l. 1- V V 2. The combination with a threaded bolt,

longitudinally compressible, and a d et 's'wlrable body controlling and: ,in'dltbsingf the l thread-piece, the contiguous snrfae'es'of the 1 Witnesses:

Enos B. WH TMQRE', Li WINSTON, Q

bolttrather than the body C to turn upon the 25 5 thread-piece. If, however, there should be of a'thread-piece 0f spirally-woundwire tain any pasee-tendency of the body Cto turn i pere'd end longitudinally eompressi bleyand 11 en the thjlfld' pie, said bedy'C Ind "be=ifitted to" the th e'adsof ye. bolt to project Belernally longitndi n al'l y corr'ngmted, assho'ww* ydndfifihfififi'FhBlYF fthe'b'olt; and a sepaat h in Fig. 2, or other simple and well-known rate body for, 'i nclos in'g and controlling the 5cmv his means may be provided to earnsethe control gthsreadapi eee mlpifi body havingatapered openling-body and the thread-piece to turn to- =g Corresponding t'othe taper of the thread-, gether; but the former having the advantage"v piece and the whole adapted to serve substanoflevemg-e over the th-reed-pi-eee,- as above: tial lylierein shown and: described; stated; willtend f0 ceiisethe thread-piece to In'wit'ness'whereof l'have hereunto set my 35 1 5 move with it when turned, ajsstatedl. v mud-i thik tth-dttYcifi June, 1900, in the pres- VVhat I claim as my inventionis ence of two subscribing witnesses. 1. Athreade'd bolt', in Combination with: aun: -1- independentor detachable s-pi:r:tlth;rewd-piene GEORGE SHEFFIELD- 

